Calculating device



Patented June 12, 1934 UNITED STATES PATENT OFFICE "some mnrcn. CONTIIPLmsaa'rus Louis Gllman, Chelsea, mu. Application December a, 19 SerialNo. 101,020

' 1 Claims. (ci. ts-as) The present invention is an improvement uponthat disclosed in my U. 8. Letters Patent No. 1,938,899, issued December12, 1933.

In the drawing accompanying and forming a part of this specification-Figure 1 is a perspective view of an electrical control apparatusembodying my invention;

Fig. 2 is a fragmentary perspective view on an enlarged scale;

Fig. 3 is a diagram of circuits that may be used in connection with theapparatus shown in Fig. 1.

In the particular drawing selected for more fully disclosing theprinciple of my invention,

10 is an aggregate motion selector consisting in the present instance ofa vertically-disposed tubular member carrying at its upper end arectangular platen 11 having a blank at the center thereof and arrangedfor movement substantially in a single plane. Said selector is connectedfor universal motion by the gimbal 12 to a suitable support 13, the pin14 passing through the selector and having its bearings in the ring 15and the oppositely-disposed pins 16 pivotally connecting said ring andsupport.

Two sets of electromagnetically-operable mechanisms, herein shown assolenoids, are disposed substantially in quadrature and operativelyassociated with the selector. The solenoids A, B, C constitute one setand the solenoids D, E, F the 80 other.

In the present instance the solenoids A and B of one set and E and F ofthe other are shown as connected to the selector on opposite sides ofits point of connection to the support, and

5 the solenoid C of the first set and the solenoid D of the second setconnected similarly thereto. This, however, is not essential and therelative position of the gimbal 12 with respect to the points ofattachment of the solenoids to the selector is immaterial. This will beapparent when it is considered that in no case do the solenoids move theselector about the pins 14 or 16 as pivots. For example, if the letterto be selected requires the energiza ion of the solenoids C and 4 D, theformer will act on the selector about the point of connection of the rod18 thereto as a fulcrum and the latter will act thereon about the pointof connection of the rod 20 thereto as a fulcrum with the result thatnot only is the 0 selector tipped in two different directions by saidsolenoids but also there is produced a sliding movement of the ring 15over the pins 16 and a sliding movement of the selector along the pin14. The result of the several movements is that the selected letteris-brought under the actuator 23.

By way of further example, if the selected letter requires theenergization of the solenoids A, B, C and D, it will be apparent thatthe ac- 00 tion of the solenoids A, B and C will cause the rinfiQtoslide along the pins 18 and the action of thesolenoid D acting on theselector against the D t of connection of the rod 20 thereto as a fulcnm will tilt or swing the selector and that the igesuit of these motionswill be such as to bring gfthe desired letter under the actuator. Inothe ;words, the said gimbal is merely a support the selector and itsfunction is to prevent a xifal or rotational movement of the same.

The solenoids aforesaid correspond to the electromag'iiets shown inFigs. 5 and 9 of my patent aforesaid. As explained in said patent thesimuiteneons actuation of all six magnets will result in lib movement ofthe platen.

In theipresent instance the simultaneous actuation or the six solenoidsA-F will in like manner result in no movement of the platen and thisresult is effected by adjusting the throw of the solenoids with respectto the distances from the platen to their respective points ofattachment to the selector. In the form of the invention shown in r'i 1the throw of the solenoids A, B, D is less than that of the solenoids C,E. F.

By any suitable means such as linkage systems the solenoids may beoperatively associated with the selector. In the present instance thesolenoids A, B are connected to the link 17 and the latter by the rod 18to the selector; similarly the solenoids E, F are connected to the link19 and the latter to the selector by the rod 20.

In the particular embodiment shown in the drawing the solenoids C and Dare connected to the selector by the rods 21, 22, respectively. The rodsaforesaid preferably are slightly flexible.

By selectively energizing at least one ofthe solenoids of each set theplaten is moved from its neutral position at which the blank at thecenter thereof is under the core of the electromagnetic actuator 23 tosuch position as to bring the selected letter under said actuator, asexplained in detail in the above-mentioned patent.

In the present instance a strip of carbon paper 24 is caused by suitablemechanism to move intermittently over the face of the platen and thetape 25 disposed over the carbon strip and under the actuator is causedto move intermittently in a direction at right angles to that of saidcarbon strip.

In Figs. 5 and 9 of my patent aforesaid each set of-electromagnetsconsists of two members placed side by side and extending toward theplaten, and a third oppositely-disposed member extending away from theplaten and serving to move the latter in a direction opposite to thateffected by the energization of one or both of the other members. In thepresent instance the same result is accomplished by connecting two ofthe solenoids of one set with the selector on one side of the point ofconnection of the same June 12, 1934.

L.. A. GRAHAM Filed June 22, 1935 INVENTOR ATTORNEY Patented June'l2,1934 UNITED STATES ATENr OFFICE 10 Claims.

This invention relates to calculating devices of the circular slide ruletype.

Slide rules, of the circular as well as the straight type, ordinarilyinclude three relatively movable members, commonly known .as thestationary member or base, the slide, and the runner. The base and slideare equipped with coacting logarithmic scales relatively movable byadjustments of the slide to effect the calculations, and

l the runner is equipped with an indicator or finder which facilitatesthe calculating process. The runner and slide are ordinarilyindependently mounted on the base in accurately formed guidewaysprovided for the purpose, special provision being usually made to retaineach against accidental displacement relative to the base duringadjustment of the other. The accuracies and mechanical refinements inthe guideways and retainers, necessary for accurate results, are theprimary cause of the high cost of slide rules now in general use. I

An object of the present invention is to provide a circular slide rulewhich may be inexpensively produced without sacrificing ease ofoperation or accuracy of results. This I accomplish by the use of threesuperposed members, corresponding respectively to. the base, slide, andrunner of an ordinary slide rule, connected for relative rotation by andabout a common central pivot, and so constructed as to readily effectselective manual adjustment of any one of said members relative to theother two, while the other two are manually held against adjustmentrelative to each other. By that arrangement it is possible to ieliminate the expensive guides and retainers heretofore required foraccurate results.

Other more specific objects and advantages will appear from thefollowing description of a circular slide rule constructed in accordancewith the present invention.

In the accompanying drawing:-

Figure 1 is a plan view of a slide rule embody.- ing this invention,showing a part thereof broken away to facilitate illustration.

Fig. 2 is a plan view showing the parts in different positions ofadjustment.

Fig. 3 is a section on the line 3-3 of Fig. 1.

The slide rule "selected for illustration comprises three superposedmembers 10, 20, and 30, connected by an appropriate pivot 40 for freeindependent rotation about a common center. These members arepreferably, though not neces-' sarily, in the form of disks, andcorrespond, respectively, to the base, slide, and runner of an ordinaryslide rule.

Although they may be variously arranged, the bottom or base" disk is ofa diameter somewhat greater than the others, so as to provide an exposedmarginal portion 11. This disk is provided with a circular logarithmicscale 13 con- 60 centric with the pivot 40.

The intermediate or slide disk is provided with a circular logarithmicscale 23 adjacent, parallel to, and surrounding the scale 13. The scale13 is visible through the'disk 20, either by making the disk 20 oftransparent material, or by the provision of a circular slot 24 thereinoverlying the scale 13, and bridged by narrow connectors 25, whichsustain the outer scale carrying portion of the disk 20. I

The top or runner disk 30 covers both scales to protect the same fromdirt and from injury.' Although this disk may also be formed oftransparent material, it is preferably opaque and equipped with a window33 through which a portion of each scale is visible, the windowpreferably being divided by a narrow arcuate strip 34 overlying theadjacent edges of the scales. A radial line 35 applied to the face ofthe disk 30,

centrally of the window, provides a finder or-indicator forcoaction withthe scales in the usual manner. I

The bottom disk 10 is manually actuated and controlled by its exposedmarginal portion 11, and the intermediate and top disks 20 and 30 35 areindependently actuated by projecting tabs preferably arranged in themanner now to be described.

In the slide rule shown, the several tabs are identical in form and allproject beyond the bottom disk 10. Two tabs 21 and 22 are provided onthe intermediate disk 20, spaced one hundred and eighty degrees apart,the tab 21 being symmetrically disposed or aligned with the unitygraduation on the scale 23. Two tabs 31 and 32 are also provided on thetop disk 30, spaced ninety degrees apart,.the tab 31 being symmetricallydisposed or aligned with the finder line 35 on the disk 30. The factthat the tabs on each disk are differently spaced from those on 1 theother disk, assures that one tab is always I available for the actuationof its disk without interference with a tab on the other disk, and, dueto the particular arrangement of tabs 21 and 31, the finder line 35 maybe readily registered with the unity graduation on scale 13, by merelyregistering the tab 31 with tab 21, as indicated in Fig. 1. With thetabs 21 and 31 thus positioned, the device is ready to perform acalculation.

